海城镁矿地区土壤镁污染评价及修复研究

Study on Magnesium Polluted Soil and Remediation in Haicheng Magnesium Mine

对辽宁海城镁矿周边耕层土壤镁污染状况进行调查,然后采用生理酸性肥料和有机肥,利用共沉淀原理,对污染土壤进行了修复研究,得出主要结论如下:海城镁矿地区耕层土壤总镁含量较高。按照单因子污染指数进行分级,非污染(P<1)和轻度污染土壤样点(1<P≤2)为0;中度污染(2<P≤3)土壤样点占总采样点的37.5%;严重污染土壤(P>3)样点,占总采样点的62.5%;过磷酸钙和硫酸铵配合使用,可有效降低土壤中镁的浓度,取得明显的修复效果。其中,硫酸铵的影响达到极显著水平,过磷酸钙的影响达到显著性水平,而有机肥对水溶镁的去除和生物量的影响较小,没有达到显著水平;通过正交试验确定水溶镁去除的最优实验条件为硫酸铵2.7g/kg、过磷酸钙1.00g/kg,有机肥量25.0g/kg。促进作物生物量的最优实验条件为:硫酸铵2.7g/kg、过磷酸钙0.75g/kg,有机肥量25.0g/kg。

This paper describes the magnesium pollution status of top soil around Haicheng magnesium in Liaoning.Physiological acid fertilizers and manure were adopted to remediate magnesium pollution soil by the principle of co-precipitation. Results were as follows： the content of magnesium in top soil is higher. According to single factor pollution index,the percentage of no pollution（ P〈 1） and slight pollution（ 1〈 P≤2） soil samples was zero,and moderate pollution（ 2〈 P≤3） and heavy pollution（ P 〉3） soil samples were 37. 5% and 62. 5% respectively. The combined use of calcium phosphate and ammonium sulphate can effectively decrease the content of soluble magnesium and achieve obvious remediation effect. The effect of ammonium sulphate reached very significant level,and calcium phosphate reached significant level. The organic manure had no significant influence on removal of soluble magnesium and biology quantity.The optimum conditions for the removal of soluble magnesium through orthogonal test were： ammonium sulphate 2. 7g / kg,calcium phosphate 1. 00 g / kg and organic manure 25. 0g / kg; the most optimal conditions for the biology quantity were：ammonium sulphate 2. 7g / kg,calcium phosphate 0. 75 g / kg and organic manure 25. 0g / kg.